xml解析期间的内存泄漏问题？

Question

我得到了内存泄漏的奇怪问题，

现在我的代码，

-(NSMutableDictionary *)getParsedWallpaperData{ 
NSMutableDictionary *dataDictionary = [NSMutableDictionary dictionary]; 

NSData *xmlData = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"Wallpaper" ofType:@"xml"]]; 
TBXML *tbXml = [[TBXML alloc] initWithXMLData:xmlData error:nil]; 

//TBXML *tbXml = [[TBXML tbxmlWithXMLData:xmlData error:nil] autorelease]; 

@synchronized(self){ 
    TBXMLElement *rootXMLElement = tbXml.rootXMLElement; 

    if(rootXMLElement) 
    { 
     TBXMLElement *paging = [TBXML childElementNamed:kPaging parentElement:rootXMLElement]; 
     NSMutableDictionary *pagingData = [[NSMutableDictionary alloc] init]; 
     if(paging){ 
      TBXMLElement *totalPages = [TBXML childElementNamed:kTotalPages parentElement:paging]; 
      NSString *totalPagesString = [TBXML textForElement:totalPages]; 
      [pagingData setObject:totalPagesString forKey:@"TotalPages"]; 

      TBXMLElement *currentPage = [TBXML childElementNamed:kCurrentPage parentElement:paging]; 
      NSString *currentPageString = [TBXML textForElement:currentPage]; 
      [pagingData setObject:currentPageString forKey:@"CurrentPage"]; 

      TBXMLElement *prevPage = [TBXML childElementNamed:kPerviousPage parentElement:paging]; 
      NSString *prevPageString = [TBXML textForElement:prevPage]; 
      [pagingData setObject:prevPageString forKey:@"PreviousPage"]; 

      TBXMLElement *nextPage = [TBXML childElementNamed:kNextPage parentElement:paging]; 
      NSString *nextPageString = [TBXML textForElement:nextPage]; 
      [pagingData setObject:nextPageString forKey:@"NextPage"]; 
     } 
     [dataDictionary setObject:pagingData forKey:@"PagingInfo"]; 
     [pagingData release]; 
     pagingData = nil; 

     TBXMLElement *totalItems = [TBXML childElementNamed:kTotalItems parentElement:rootXMLElement]; 
     NSString *totalItemsString = [TBXML textForElement:totalItems]; 
     [dataDictionary setObject:totalItemsString forKey:@"TotalItems"]; 

     NSMutableArray *itemArray = [[NSMutableArray alloc] initWithCapacity:[totalItemsString intValue]]; 

     TBXMLElement *items = [TBXML childElementNamed:kItems parentElement:rootXMLElement]; 
     if(items){ 
      TBXMLElement *item = [TBXML childElementNamed:kItem parentElement:items]; 
      while (item) { 
       NSMutableDictionary *itemInfoDict = [[NSMutableDictionary alloc] init]; 
       TBXMLElement *title = [TBXML childElementNamed:kTitle parentElement:item]; 
       NSString *titleString = [TBXML textForElement:title]; 
       [itemInfoDict setObject:titleString forKey:@"Title"]; 

       TBXMLElement *image1 = [TBXML childElementNamed:kImage1 parentElement:item]; 
       NSString *image1String = [TBXML textForElement:image1]; 
       [itemInfoDict setObject:image1String forKey:@"Image1"]; 

       TBXMLElement *image2 = [TBXML childElementNamed:kImage2 parentElement:item]; 
       NSString *image2String = [TBXML textForElement:image2]; 
       [itemInfoDict setObject:image2String forKey:@"Image2"]; 

       TBXMLElement *image3 = [TBXML childElementNamed:kImage3 parentElement:item]; 
       NSString *image3String = [TBXML textForElement:image3]; 
       [itemInfoDict setObject:image3String forKey:@"Image3"]; 

       TBXMLElement *thumbnail = [TBXML childElementNamed:kThumbnail parentElement:item]; 
       NSString *thumbnailString = [TBXML textForElement:thumbnail]; 
       [itemInfoDict setObject:thumbnailString forKey:@"Thumbnail"]; 

       [itemArray addObject:itemInfoDict]; 
       [itemInfoDict release]; 
       itemInfoDict = nil; 
       item = item -> nextSibling; 
      } 
     } 
     [dataDictionary setObject:itemArray forKey:@"ImagesInfo"]; 
     [itemArray release]; 
     itemArray = nil; 
    } 
} 

[tbXml release]; 
tbXml = nil; 
return dataDictionary; 
} 

我发现内存泄漏只TBXML * TBXML = [[TBXML页头] initWithXMLData：XMLDATA错误：零]在这一行上，即使我手动释放tbXml对象，

请给我建议y发生这种情况？

感谢，

Answer 1

那么，如果它的根元素有展示为漏水，我想知道，如果像childElementNamed的访问者的一个原因造成的（通过返回的东西，就像一个的NSString但实际上也已经优化了存储回根元素的指针）。你可以看看childElementNamed的执行情况吗？一种相对较快的方式来更改您的代码，以确保它不是将您要存储在dataDictionary那里的任何NSString结果用[NSString stringWithFormat:@"%@", [TBXML textForElement:fooTitle]]调用打包。

此外，如果TBXML正在创建大量的自动释放对象，则可以将此函数包装在一个@nsautoreleasepool宏中。

作为最终建议，如果可以的话，您应该看看ARC（即，如果您正在部署到iOS 4+）。

Answer 2

在你的函数的顶部添加此行：

NSAutoreleasePool *Pool=[[NSAutoreleasePool alloc]init]; 

，并在你的函数的底部之前加入这一行“return”语句：

[Pool drain]; 

也许这将帮助你。